Ranges of 7.5- to 52-kevH2+,D2+,He+, andNe+Ions in Quartz

Abstract

Experimental values of penetration depths of positive ions in quartz obtained from measurements of reflection coefficient versus wavelength are compared with theoretical predictions. Measurements of the change in refractive index of quartz as a function of the energy dissipated per unit volume are shown to give experimental values for the ratio of energy loss due to displacement collisions per unit thickness to the energy loss due to ionization per unit thickness. The energy loss due to displacement collisions per unit thickness agrees with theoretical predictions. From the experimental values of energy loss due to ionization, it is found that the cross sections for scattering of valence electrons by the field of the incident atoms are an order of magnitude larger than the geometric cross sections.